“Although aluminum prices are down, the fundamentals of the aluminum market remain sound with strong demand and tight supply, and Alcoa is successfully capitalizing on accelerating demand in high-growth end markets such as aerospace and automotive,” said Klaus Kleinfeld, Chairman and CEO in a prepared statement. Shares gained slightly in after-hours trading. (Click here for extended-hours quote.)

AMD - The semiconductor company said it expects revenue to fall 11 percentfrom last quarter versus previous guidance of a 3-percent gain. The company also reported that they expect softer than expected channel sales in Europe and China. The company will announce earnings on July 19. Shares slid in after-hours trading. (Click here for extended-hours quote.)

Mako - The surgical products developer posted lower-than-expected sales of its surgical robot for the second quarter in a row. In addition, the company said it now expects to sell between 42 to 48 RIO systems (Robotic Arm Interactive Orthopedic System) in 2012, down from an earlier forecast of 52 to 58, due to the slower-than-expected start during the first six months of the year. Shares plunged sharply in after-hours trading. (Click here for extended-hours quote.)

Denny's - The restaurant chain said it signed an agreement with Great China International Group to open 50 restaurants in southern China over the next 15 years. Shares jumped in extended-hours trading. (Click here for extended-hours quote.)

PriceSmart - The largest operator of membership warehouse clubs in Central America posted earnings of 52 cents a share on sales of $507 million, missing estimates for 59 cents a share on revenue of $511 million. Shares slumped in extended-hours trading. (Click here for extended-hours quote.)